Sit in good body alignment (abs tight, chest up, back straight). Keep arms up and grips directly over chest with wrists straight. Keep shoulder blades squeezed together (retracted) and maintain position throughout entire exercise. Throughout motion, shoulders form 90 degree angle to body. In a controlled motion, start retracting arms in a triangular manner until upper arms are approximately parallel to wall. While maintaining the controlled motion, push grips up to starting position without locking out elbows. Do not allow muscles to relax before next repetition.
Here are a few suggested alternative exercises:Ball Band Chest PressBall Dumbbell Chest FlysBall Dumbbell Chest PressBall Dumbbell PulloverBall Incline Dumbbell FlyBall Incline Dumbbell PressBall Push UpsBand Chest PressBand Decline Chest PressBand Incline Chest PressBench Press - BarbellBench Press - Hammer StrengthCable CrossoverCable PulloverChest Press - Hammer StrengthChest Press - MachineDecline Bench Press - BarbellDecline Dumbbell FlyDecline Dumbbell PressFlat Dumbbell FlyFlat Dumbbell PressIncline Dumbbell FlyIncline Dumbbell PressPush Ups